it would all depend on numbers really .
If there is just a few people using it ...no problem . A working compost heap needs a lot of moisture and could easily cope with half a dozen people using it.
It must be a working compost heap though !! not one that is filed and finished working .
If there are loads of people using it

then just provide a straw bale , for the chaps and a bucket for the ladies ... apply as and when needed .
You can water it down too ... anything around 20-1 ratio of water to pee would be fine . This can then be used on your plants as a fertiliser , or to water the compost heap .
If you use a bucket , don't have it sitting around for too long in the summer , as you will just end up with ammonia and a bad stink !!!
Again ...an average compost heap can easily cope with a normal family using it during the day , as long as the compost heap has a good amount of material in it and is in use ... not in the standing waiting to be spread stage .
Just remember , be careful if anyone is on medication , the pill or takes drugs , family you will know about , others you may not !!
Salt may also be a problem if your family uses too much of it , or eats lots of ready meals or processed stuff in general . The reason being , the body chucks out most of the unwanted salt from the body in pee, but this would only be a problem with people on a very high salt intake .It would help keep the slugs away though !!!
cheers
Russ